ABSTRACT
BACKGROUND: The occurrence of Patellofemoral Pain Syndrome (PFPS) is often found in daily medical care. Rehabilitation is usually applied with good results. However, patients often do not respond to standard rehabilitation, suggesting there may be some undetected factors that standard treatments cannot address. It is known that post-traumatic adhesive capsulitis in the knee often shows symptoms similar to those of PFPS, but idiopathic adhesive capsulitis (IAC) has seldom been mentioned as a possible cause of PFPS. Adhesive capsulitis in the shoulder joint causes frozen shoulder (FS), and hydraulic distension (HD) is often applied to FS effectively. PURPOSE: The purpose of this study was to investigate and report on the clinical application of HD to treat PFPS non-responsive to rehabilitation treatment. PATIENTS AND METHODS: HD was applied to 72 knees that had resisted regular conservative treatments for PFPS. Follow-up data (e.g. visual analogue scale) was collected immediately after HD, and at periods of 1, 3 and 6 months later. RESULTS: Of the 72 patients, 64 patients obtained pain relief after HD. Pain was relieved for at least 6 months for 33 of the 64 patients. No benefit was received for 8 patients. CONCLUSIONS: HD could be an additional conservative option for some PFPS that resisted rehabilitation. Assuming that the mechanisms of action for HD in the knee are the same as those in FS, there is evidence to suggest that IAC might play a role in the development of PFPS for some patients.